/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */
#include "mongo/db/exec/agg/list_catalog_stage.h"

#include "mongo/db/exec/agg/document_source_to_stage_registry.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/db/pipeline/document_source_list_catalog.h"
#include "mongo/util/assert_util.h"

namespace mongo {

boost::intrusive_ptr<exec::agg::Stage> documentSourceListCatalogToStageFn(
    const boost::intrusive_ptr<DocumentSource>& documentSource) {
    auto* listCatalogDS = dynamic_cast<DocumentSourceListCatalog*>(documentSource.get());

    tassert(10812303, "expected 'DocumentSourceListCatalog' type", listCatalogDS);

    return make_intrusive<exec::agg::ListCatalogStage>(listCatalogDS->kStageName,
                                                       listCatalogDS->getExpCtx());
}

namespace exec::agg {

REGISTER_AGG_STAGE_MAPPING(listCatalog,
                           DocumentSourceListCatalog::id,
                           documentSourceListCatalogToStageFn)

ListCatalogStage::ListCatalogStage(StringData stageName,
                                   const boost::intrusive_ptr<ExpressionContext>& pExpCtx)
    : Stage(stageName, pExpCtx) {}

GetNextResult ListCatalogStage::doGetNext() {
    if (!_catalogDocs) {
        if (pExpCtx->getNamespaceString().isCollectionlessAggregateNS()) {
            _catalogDocs =
                pExpCtx->getMongoProcessInterface()->listCatalog(pExpCtx->getOperationContext());
        } else if (auto catalogDoc = pExpCtx->getMongoProcessInterface()->getCatalogEntry(
                       pExpCtx->getOperationContext(),
                       pExpCtx->getNamespaceString(),
                       pExpCtx->getUUID())) {
            _catalogDocs = {{std::move(*catalogDoc)}};
        } else {
            _catalogDocs.emplace();
        }
    }

    if (!_catalogDocs->empty()) {
        Document doc{_catalogDocs->front()};
        _catalogDocs->pop_front();
        return doc;
    }

    return GetNextResult::makeEOF();
}

}  // namespace exec::agg
}  // namespace mongo
